# Scale problem

1. Jan 22, 2004

### kishtik

We have a helicopter flying and use the power "P" to keep it in equilibrium. But if the scale was greater n times, what would be the power to keep it there?

2. Jan 24, 2004

### Allegro

3. Jan 24, 2004

### kishtik

Thanks, but didn't need such detail. I thought that if the scale was greater n times then the volume of the helicopter had to be proportional to n^3. So with the same density, its mass also had to be proportional to n^3.
$$P= \Delta W/t$$

$$P=F \Delta x/t$$

$$P=mg \Delta x/t$$

So if m increases n^3 times, P must increase n^3 times and the new power would be n^3P.
Was I wrong?

for latex.

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